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Old 2021-01-20, 09:43   #1
bur
 
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Aug 2020
79*6581e-4;3*2539e-3

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Default 2^1571237 · (1153# - 1) + 1 - why was it constructed like that?

2^1571237 * (1153# - 1) + 1 is a new prime submitted to PrimePages.

It is almost a PrimoProth, which are interesting in that they have a low weight, but why the -1? It decreases the number of small factors of N-1, but if you're after that, you might just use a prime for k.
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